Hypodermic syringe



Feb. 3, 1942. L. EISELE 2,271,546

HYPODERMIC SYRINGE Filed April 24, 1959 Zoe/1N EUE'LE IN VENTOR.

Patented Feb. 3, 1942 UNITED STATES PATENToF ICE HYPODERMIC SYRINGE Logan Eisele, Nashville, Tenn.

Application April 24, 1939, Serial N 0. 269,591

2 Claims.

This invention relates to hypodermic syringes and has for its primary object to provide means for establishing a reliable connection between the hypodermic needle and the syringe body, which connection will not separate in use but at the same time will be easily and quickly separable by the operator.

A further object of this invention is to provide a device of this character which is free from inaccessible dirt collecting crevices and which may thus be cleaned and sterilized properly.

A further object of this invention is to provide a device of this character which is capable of use with hypodermic syringe needles of standard types now available on the market.

A further object of this invention is to provide a device of this character which may be easily and cheaply manufactured, is of neat and pleasing appearance, and is not likely to get out of order.

The means by which these and other objects, which will later appear, are accomplished may be clearly understood by reference to the accompanying drawing, in which:

Figure 1 is a partial longitudinal section of a portion of a hypodermic syringe and needle incorporating my invention,

Figure 2 is a cross sectional view of the same taken along the line 22 of Figure 1, and

Figure 3 is a sectional view taken along the line 33 of Figure 2.

Referring now in greater detail to the drawing the numeral It) indicates a syringe body, usually made of glass. A cap member I I, preferably made of metal is permanently attached by cementing, thermal contraction, welding or like means over the reduced portion [2 of body l0. Cap H is provided with an externally tapering discharge nozzle tip l3 adapted to receive the usual internally tapered needle hub l4 and form therewith a slip joint which is leak proof. Projecting from the outer face of cap H, spaced from nozzle tip 13 and substantially parallel thereto is the projection [5 which has formed in its face adjacent nozzle tip I3 a depression I6 of the form of a portion of the internal surface of a frustum of a cone. The axis A of this frustum is spaced laterally from the longitudinal axis B of the syringe and is inclined to or forms a suitable angle with a plane normal to axis B.

This depression H5 is adapted to engage a corner ll of flange I8 which is carried by practically all hypodermic needles now available on the market. In operation the hub M which carries the usual cannula W is placed upon the nozzle tip [3, the fiat or cut-away portions 20 0f the flange 18 passing by projection l5. When-the tapers seat together, the hub is given a slight twist relative to the nozzle tip I3 thus causing a corner I! to pass into depression 16 and engage the surface thereof in such manner as to wedge the hub l4 upon the nozzle tip l3 in two directions. That is, due to the particularly contour of the internal surface of depression l6 of the hub I4 is urged radially against nozzle tip l3 and at the same time is urged longitudinally thereon. This double wedging effect has proved very advantageous and constitutes one of the chief features of the device.

Also due to the particular contour of the, internal surface of the depression, 16 a wide variety of sizes of needle hubs may be accommodated some fitting further on the tapered nozzle tip I3,

some turning through a greater angle before engaging the internal surface of depression IE, but all finding some point of engagement upon said surface and being wedged thereby, in two directions upon nozzle tip [3.

The removal of hub 14 simply requires a slight twist in a reverse direction whereupon corner I! is caused to emerge from depression I6 whereupon hub I4 may be completely removed.

Since the device contains no hidden or inaccessible portions it may be very readily cleaned,

sterilized and inspected.

stantially parallel to said nozzle, said projection having formed in one face thereof a depression of the form of the internal surface of a frustum of a cone whose axis is spaced laterally from the longitudinal axisof the syringe and inclined with respect to a plane normal .to said longitudinal axis of the syringe, said depression being adapted to engage a portion of said needle hub.

2. In a syringe, a tip for receiving a needle hub, a needle hub receivable upon said tip, re-

taining means for said needle hub comprising a retaining member spaced from and substantially parallel to said tip and having formed in one face thereof a depression of the form of the internal surface of a truncated cone, the axis of said depression being inclined to a plane normal to the axis of said tip, said depression being adapted to engage a portion of said needle hub.

- LOGAN EISELE. 

